1993 speedometer on crack
Thread Starter
3rd Gear
Joined: Jul 2021
Posts: 3
Likes: 3
1993 speedometer on crack
After about 20 minutes of driving the speedometer will start reading random numbers that vary around 20 or 30 mph below and above what I am currently driving. I checked the plastic gears and they are in good condition. This also messes up my cruise control and the radio VSC. I read that it could be a connection somewhere or it could be the speed sensor which is hard to find. Where would be any connections in the wires to check? Any other ideas? Car has an automatic transmission.
Team Owner
Joined: Sep 2003
Posts: 25,393
Likes: 2,741
What rear axle ratio? That would have much to do with the availability of the VSS.
The connector at the VSS is very common and an easy replace. If your car is a C68, what does that display for MPH? Cruise, VSC and display are all 'after' the ECM! Cut/splice or connector and do your own terminations might be a reasonable next move.
The connector at the VSS is very common and an easy replace. If your car is a C68, what does that display for MPH? Cruise, VSC and display are all 'after' the ECM! Cut/splice or connector and do your own terminations might be a reasonable next move.
Last edited by WVZR-1; Jan 5, 2022 at 11:51 AM.
Drifting
Joined: Jul 2009
Posts: 1,258
Likes: 98
From: Ashland PA
2021 C4 of the Year - Modified Finalist
I had a similar problem with my 90, the speedometer would start jumping all over the place, it turned out to be the wire running from the ecm through the firewall to the connector under the passenger side dash, I ended up running a new wire from the ecm and bypassing the connector. That fixed the problem.
